42_push_swap/ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angouleme.fr  +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/08 18:27:58 by cchauvet          #+#    #+#             */
/*   Updated: 2022/12/11 17:41:54 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "pushswap.h"

long int	ft_atoi(char *str)
{
	long int	nb;
	int			i;
	int			sign;

	i = 0;
	sign = 1;
	nb = 0;
	while (str[i] == '+' || str[i] == '-')
	{
		if (str[i] == '-')
			sign *= -1;
		i++;
	}
	while (str[i] != '\0')
	{
		nb = nb * 10 + str[i] - '0';
		i++;
	}
	return (nb * sign);
}